Machine for producing toothed discs



De@ 30, 1947- H. G. KELLER ET AL MACHINE FOR PRODUCING TOOTHED DISCS Filed May 20, 1945 16 Sheets-Sheet l -RIJ'IY WMM [07712 Fifi) De@ 30, 1947- H. G. KELLER ET A1.

MACHINE FOR PRODUCING TOOTHED DISCS Filed May 20, 1945 16 Sheets-Sheet 2 Nm mm wm "W Q/YVOMS Teiler and Dec.l30, 1947. H. G. KELLER ET AL l I' 2,433,564

MACHINE FOR PRODUCIG TOOTHED DISCS @my Keller 1w @arles/Z 16mg,

De@ 30, 1947- H. G. KELLER ET Al.

MACHINE FOR PRODUCING TOOTHED DISCS Filed May 20, 1943 16 Sheets-Sheet 4 Dec. 30, 1947. H, GJKELLE'R ETAAL 2,433,564

MACHINE FOR PRODUCING TOOTHED DISCS Filed' May 20, 1943 16 Sheets--Sheet'` HHH! MHHHHI Il woe/wwwa Dec. 30, 1947. H, Q KELLER ETAL 2,433,564

MACHINE FOR PRODUCING TOOTHED DISCS I Filed May 20,- 1943 v lesheets-sheet 6 Dee' 30 1947' H. G. KELLER ETA; 2,433,564

MACHINE FOR PRODUCING TOOTHED DISCS Filed May 20, 1945 16 Sheets-Sheet '7 @mwww Dec.l 30, 1947. H. G. KELLER yET AL MACHINE FOR PRODUCING TOOTHED DISCS 16 Sheets-Sheet 8 Filed May 20, 1943 f. nM w 2N maw NAN Dec. 30, 1947. H. G. KELLER ET AL MACHINE FOR PRODUCING TOOTHED DISCS 1e sheets-sheet 9 Filed May 20, 1945 r vu om @IWI/e1' @d Dec. 30, 1947. H. G. KELLER ET AL MACHINE FOR PRODUCING TOOTHED DISCS Filed May 20, 1943 16 Sheets- Sheet lO MSN Charles/l 261mg; J7?

Dec. 30; 947 H. G. KELLER ETAL v MACHINE FOR PRODUCING TOOTHED DISCS Filed May 20, 1945 16 Sheets-Sheet ll gmc/whom /ll' and @Illy /Mrlesllzmy, 061

Dec. 30, 1947.

H. G. KELLER ET AL MACHINE FOR PRODUCING TOOTHED DISCS Filed May 20, 1943 16 Sheets-Sheet l2 Iain' wnllmll DC- 30, 1947' H. G. KELLER ET AL. 2,433,564

MACHINE FOR PRODUGING TOOTHED DISCS Filed May 20, 1943 16 Sheets-Sheet 13 Dec. 30, 1947. H. G. KELLER ET Al.-

MACHINE FOR PRODUCING TOOTHED DISCS '16 Sheets-Sheet 14 Filed May 2o, 1943 IVIIIHIIJIIIHIII lll Dec. 30, 1947. H. G. KELLER ET AL MACHINE FOR PRODUCING TOOTHED DISCS 16 Sheets-Sheet 15 Filed May 20, 1945 l w/i/:L ma' CFM Marx/NG CENTER 1 403 16 Sheets-Sheet 16 cur a2 `@Tagan/smarger/upm- H. G. KELLER ET AL MACHINE FOR PRoDUoING TooTHED Dlscs Filed May 2o, 1943 Dec. 30, 1947.

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Afri@ 210607' Patented Dec. 30, 1947 MACHINE FOR I-RODUCINGY'IOGTHED DISC Henry G. Keller, Glenside, and Charles M. Young, Jr., Philadelphia, Pa., assignors to Link-Belt Company, a corporation of Illinois Application May 2o, 1943, serial No. 487,782

26 claims. (ol. sic-15.1)

This invention relates to new and useful im provements in machines for producing toothed discs.

It is the primary object of this invention to provide a machine that is particularly adapted to produce the toothed faces on conical pulley wheel discs used in innitely variable speed transmissions of the positive type, known commercially as l?. I. V. gear.

Each one of these P. I. V. gear units requires four of these conical discs. The discs are arranged in two pairs by being slidably splined or keyed on parallel driver and driven shafts. The toothed conical faces of each pair of discs are arranged so as to collectively form a V-pulley wheel assembly. A chain, having slat packs carried by its links, is trained over the pulley wheels to provide a power transmission connection between the shafts. The discs of each pair are adjustable toward and from each other to vary the effective diameters of the pulley wheels. The ratio of the drive between the two shafts is changed by inversely varying the effective diameters of the two pulley wheels.

The conical faces of the discs are formed with radial teeth and the teeth of opposed discs are staggered; i. e., the teeth of each disc are arranged opposite the spaces or grooves of the other disc, so that the slats of each chain link pack, by partaking of proper transverse sliding movements, may have their end portions arranged to conform to and positively mesh with the teeth of both discs over the full range of effective diameters of a pulley wheel.

At the present time pulley wheel discs are being produced in several different sizes. The diameters of the disc faces for these sizes range from 41A inches upto 15% inches. The radial dimensions of the teeth formed on these discs range from approximately 1 inch to approximately 6 inches. Discs measuring up to 18 inches in diameter, having teeth of correspondingly greater radial dimensions, are contemplated for the future. These teeth are tapered radially, or widened outwardly, and are formed with beveled side faces or flanks. preferred practice, the teeth are extremely shallow and of uniform depth throughout their lengths while the top faces of the individual teeth are comparatively wide. The center lines of the teeth as well as the intermediate spaces or grooves extend radially and intersect at the true axis of the disc. The remaining tooth lines, such as face, pitch, and root, however, do not radiate from said true axis.

According to the presentA It is a furtherv important object of this invention to provide a single machine which, by employing mandrels, adapters, gage blocks, cutting tools, tool and and work moving control cams,

. and machine operation control elements of appropriate sizes and shapes', will be capable or4 producing the aforementioned full range of pulley wheel disc sizes.

Another important object of the invention is the provision of a machine of the aforementioned typewhich, after being conditioned for handling a given size disc, and upon being manually started after the blank of such a disc has been properly positioned therein, will proceed automatically through a production cycle which will bring about the formation of a complete set of teeth on the conical face of the disc blank.

Prior to the development of the present machine, dscs for P.I. V. gears have been produced on but two fundamentally different types of machines. Representative disclosures of these machines are provided by the patent to G. J. Abbott, No. 1,775,184, issuedkSeptember 9, 1930, and the patent to A. Maurer, No. 1,957,028, issued May 1, 1934. Both of these prior machines produce the tapered teeth on the conical disc faces by cutting away sufficientmaterial at the locations of the tooth spaces to form the flanks of the teeth and the grooves between these flanks.

The Abbott machine employs a xed up-milling' cutter for producing the grooves. The work partakes of a compound motion relative to the iixed cutter at each groove location. This motion includes oscillation of the work transversely of the cutter to develop the width of the groove and radial travel or feed of the work relative to the cutter to provide the length of the groove. The groove is started Iwith the cutter located at the outer end thereof and is completed when the cutter reaches the inner end of the groove. The work is rotated about its true axis for indexing to the locations of the successive grooves.

`The Maurer machine employs a planer tool motion. The work is indexed to the successive locations of the tooth tops and tooth spaces or grooves which are to be cut to produce the teeth. During the cutting of each tooth, the work partakes of a complicated compound motion relative to the straight line path of travel of the tool which will causethe material to be cut away throughout the desired depth and progressively widening breadth of the groove while leaving beveledfaces or iianks on the sides of the teeth. As

the grooves are widened radially outwardly and.

are of approximately equal width at their nar- 3 rower ends to the cutting edge of the tool, compound motion of the work must be such that the cut strokes of the tool properly traverse the width of the groove while the tool penetrates to the proper depth.

It is alfurther important object v o f this inverte., tion to provide a. milling ,machine forv producing toothed discs" by removing the' material at' circumferentially spaced intervals to form the radi,- ally tapered grooves that occur between the teeth; with each disc being indexed aboutitsmtrue axis to locate the successive grooves and being oscil. lated at each groove locatic|n a bou tl an axis other than said true axis to position the .disc f o rztlfijgiY individual cuts of the series that is required to produce each groove.

A still further important object. of .the `inven-A tion is the provision of a machine whichl will pro; duce the teeth in the conical iaces of pulley wheel discs by milling radiallyA tapered grooves in said faces, each ,of said vgrooves being formed by a predetermined number of strokes of a single milling tool Arelative to the work with each successive stroke of the series being in a reverse direction to that of the next' preceding stroke and resulting in removing a straight line cut of material, with the result that there will be no idle or return strokes and a certain number of the cuts willbe produced by tip-milling whilethe remaining cuts will 4te produced by down-'mii1mg- Another object oithe invention is to provide a inaohinewhich will operate automatically to cut any desired number of equally spaced, duplicate, radiallytapered grooves in the conical face of a disc with each' groove being produced by a series of straight line, alternate up-milling and down-milling-'cuts of uniform depth which are reduced in length as the formation of the groove progresses. Y

Further, more specific objects ofA the invention are `to provideamachi'ne for producing P. I; V. gear discs withwl'iich the cutter feed and speed may be increased up tocutter limitations; with which a minimum amount ot time isi-equiped to set up the machine for producing dilerent sizes and types of discs; with which the radial contour of Aa disc -face may be controlled by a simple cani whichwill have Aidentical contour to that desired for the finished discyvvith which 'a single, multiple lobe cani is employed` for` oscillatingA the disc blanks at each groove or space location to position the blanks Vfurthe successive; cuts 'of the series that is required to produce-each groove; andwith which, by making simple adjustments, the num'- bejr of 'teeth produeedand the shape and' dimensions of the teeth may be varied within Wide limits. Y

other objects and advantages of the 'invention will be apparent during the course of the following description.

In the accompanying drawings forminga part of this specification and in which like numerals are employed to designate likeparts throughout the saine, Y

Figure 1 isv a front elevational view of the toothed disc producing machine embodying this invention,

Figure 2 is a top plan view of the said machine, Figure 3 is an Ielevational view taken from the right hand end of the i'ria'chine,

Figure 4 is an elevational view taken from the left hand end of the machine,

Figure 5 'is 4a rear elevational view of the ma'- Chine, i f

- Figure 6 is a. seran, @target-trasportati vict' 4 of the left hand end of the machine and shows the turret supporting base portion of the machine with certain timing control mechanism and table oscillating mechanism assembled thereon,

Figure 7 is a detail, enlarged plan view of the turret, supporting base andthe oscillating table 'tutti tnelmechaism employee foi: effecting oscillation of said table,

. l Figure 8 is a detail, enlarged vertical sectional Figure 14 is a detail plan view of the mecha-'5.

nism employed for indexing the work holding' chuck about the true axis of each disc blank for placing the space or groove locations, occurring between adjacent teeth; in operative relation to the cutting tool',

Figure 15 is an'elevational view of the indexing" mechanism of Fig. 14 and taken at the right hand end of this latter figure, Y

Figure 16 is an elevational View ofthe index-ing mechanism and taken at right angles to the view of Fig. 15,. Y

. Figure A17 isv a..detail sectional view taken on Figure .18 isa detail sectional view taken on line. I8-l8..of Fig'. 14,

-Figure 19 is a schematic diagram of the hy-v draulic and electric control system which causes the machine to automatically proceed through a complete operation, cycle for producing a coin; plete set of teeth on a conical disc after thema"-V chine is manually started up; and

Figure 20 is a schematic view which illustrates the several. 'different cuts that are made in the face of a disc blank in producing one spaceor grooveoccurring between two adjacentY teeth. In Vthe drawings'. wherein for the purpose of illustration is, shown the preferred embodiment of this invention, an'drst particularly referring to Figs.. 1 to 5 inclusive, the reference character A designatesl'n tsentr'ety the Welded steel turret supportingV base 'ofthe machiiie frame. This base provides support 'and housing space for certain hydraulic 'and electric control devices. This machine base will 'not be descrittori; uetan to any 'considerable extent because such details are of no particular ir'rilzi'or'tance l Mounted en this supporting base is the work. tu" 'a aus tutti is designated in its .entiteit ai referate .traracter B. The back or rear tion'f the' v ma-'7 chine ismael@ uoof twoteided' sti'3r 1 ugrigiit posts which are designated in their entirety by the reference characters C and D. These i5 sts are arranged in back oi the turretI supporting bast. 'arid actuaron the una wigs. aber provide mounts for the tool beam guides E and F which v-s li'olalo'ly support the horizontallyniovable'tool bearn G. This ltool beam G supports the cutter head H for relative vertical movenientt This completes a generaldescription of the b asic or fundamental u'nits o f the mfarchin'e; The detail features of construction of 'these b'a-'sic units 'now will be given.

The work turret table assembly is best illus"- trated in Figs. 1 to 4 inclusive and 6 to 8 inclusive. This vassembly includes a stationary table portion 25 which is suitably mounted on and secured to the turret supporting base A. The right hand end portion of this stationary table part 25 is formed with an annular table bearing or mount 26. This bearing or mount functions to support the oscillating table part 21. A suitable detachable ring 28 is carried by the oscillatable table part 21 and bears against the inwardly directed top flange of the bearing or mount 26 to maintain this assembly. By means of this construction, the table part 21 is supported for oscillatory movement about a truly vertical axis.

The oscillata-ble table part 21 is formed with a horizontally arranged guideway 29 which functions to adjustably support the compensating chuck carriage 32. A rectangular, centrally cut away, retainer plate 3i is secured to the oscillatable table part 21 by the screws 32 to hold the compensating chuck carriage 30 in the guideway 29. Fig. 7 discloses the guideway 29 as being of greater width than the compensating chuck carriage Sil. Carriage adjusting screws 3S are provided to locate the carriage 30 within the table guideway.

The compensating chuck carriage 3i! is illustrated in Figs. 7 and 8 as having formed thereon a chuck receiving hub 34 which is formed with the bore or opening 35. This bore or opening is so formed that its axis is inclined, or forms an acute angle with respect to the axis of oscillation of the table part 21. The bore or opening 35 of the hub 313 acts as a bearing for the chuck 35 which is rotatably positioned therein. This chuck S5 supports the work for indexing movement about the axis of the hub bearing opening 35. The chuck 3S is provided with an indexing ring 31 at its upper end portion. This ring is formed with peripheral teeth through the medium of which the work holding -chuck 35 is ro tated by the indexing mechanism which will be described in detail at a later point.

The work holding chuck 36 is provided with an enlarged upper end portion Sfthat rests upon the upper end surface of the compensating chuck table hub Se. The work holding chuck 35 is retained in the bearing opening 35 or the hub by the lower end plate 39 which is suitably attached t-o the lower end of the chuck.

The chuck is provided with a tapered bore or opening for receiving the tapered shank il of work holding mandrels. It will be understood that each different sized dis-c blank will have its own work holding mandrel. The Shanks il of all of these mandrels will be of the same size so as to properly fit the tapered bore lil of the chuck 36. The mandrel heads 42, however, will vary in size to accommodate the different sized hub portions of the disc blanks. The disc blanks, which Will be designated by the reference character W in the several views, will have their hub portions supported on the head 152 of their particular sized mandrel and will be secured in place by suitable retaining mechanism d3. The disc blanks W, therefore, will rotate with the head portion G2 of their mandrel when the work hold* ing chuck 35 is indexed to arrange the successive groove locations of the disc blank in operative relation to the cutting tool. It will be seen, therefore, that the disc blanks W will be indexed about their true axis which is represented by the dash line a, Vsee Fig. 8.

The extreme lower end'portion 44 of the mandrel shank lil is threaded for connection Vwith 6 the nut 45. This nut has a head 45 which bears against the end plate 39 of the work holding chuck 35 and which is further provided with an operating wheel 41. By rotating this nut 55, the work holding mandrels are drawn into place in the tapered bore a0 of the chuck L26. This drawin nut is provided with a spring i8 that bears against the inner face of the end plate 39 and an inner end iiange to normally position the head i6 of the nut in engagement with said end plate. By rotating this nut in a clockwise direction, when viewed from below, it will draw the mandrel shank in place and by rotating the nut in a counterclockwise direction, it will be fed ofi of the end of the mandrel shank and will compress the spring 48.

The nut carries or supports a knockout pin 9 which is held in engagement with the inner end of the mandrel shank 4I by the spring 59. In other words, after the nut 45 has been backed off of the threaded end of the mandrel shank, a blow delivered to the lower end of the pin i9 will loosen the tapered mandrel shank from the tapered bore il of the work holding chuck 36.

Outwardly of the upper end of the chuck 36 there is positioned an indexable support 5i. This support acts as a rest for adapter plates 52. A different sized adapter plate is provided for each different sized disc. The adapter plates function to support the discs on annular surfaces 53, where the disc body and its hub are joined, and at the periphery 5t. mount for the coolant collecting pan 55.

It has been explained that the work holding chuck 35, the work holding mandrel, and the disc blank W are rotated in one direction, in a step-by-step manner, about the dash line a, which is the true axis of the disc mandrel, to index the disc to the successive locations of the spaces or grooves which occur between adjacent teeth. These space or groove locations, as a result of this indexing, are placed in operative relation to the path of movement of the cutting tool. These spaces or grooves between adjacent teeth are formed by the removal of. the disc material. This material, at each space or groove location, is removed by several straight line strokes of the cutting tool. Each stroke of the tool produces a cut of uniform depth, which depth corresponds with the depth of the groove. Each groove tapers radially inwardly and the series of cuts required to remove the material to form a groove are radially arranged with respect to an axis or line which intersects the groove at its narrower, inner end portion. As the cutting tool is only permitted to travel through a straight path, the disc blank must be oscillated about the axis or line with respect to which all of the straight line cuts, required to form a groove, are radially arranged. This oscillatory movement is accomplished by oscillating the table portion 21 and for that reason oscillation of each disc blank must take place about the axis of the bearing portion 26 of the stationary table part 25. This axis of oscillation remains constant and is represented by the dash line b inFig. 8.

The mechanism employed for effecting oscillation of the upper table part 21 is bestillustrated in Figs. 1, 2, 4, and 6 to 8 inclusive.

Figs. 1, 2, '1 and 8 disclose the oscillatable table part 21 as having formed thereon a laterally or radially projecting arm 55. The outer end portion of this arm has pivotally connected thereto, by the pin 56, the inner part 51 of a spring This support 5I, also, acts as a '7 enclosing *housing 0which .further v'includes the .Outer part 158. The outer part of this .Spring housing is supported for pivotal movementabout `a vertical aXis by means of the shaft V55 `which is journaledin the bearing 5,0 supported on the y left hand rear corner portion of .the Vstationary table part 25. The two parts 51 and 5.8 offthis lhousingare telescopicallyassociated with each other and the'inner housing part 51 is slidable axially relativeto theouter housing part 5B. A helicaLcompression spring 59 is enclosed within these housing .parts and functions to urge the inner housing part 51 outwardly 'with respect to the `outer housing part -,58. An `adjustable end .bearing membergll bears .against .the end of -.the spring 59' which is received in the housingpart 58. `This.,adjustable.endbearing is employed for varying the compressioniforce ofthe spring 59 for any given .positionof .the oscillating table arm .55. It -will he seen, therefore, that the ,spring `59"will normally function to force `or urge the oscillating table armg55 in a `counter- .clockwise direction, when viewed from above.

The oscillatory movements of the table part 121 are brought. about by a multiple lobe master cam 6l which engages a roller 62 that is mounted A on the lower endof the shaft 63 that passes through the table arm 55. .Figg shows the lower endportion 64 ofitln's rollermounting shaft 6.3 :as being eccentricallyarranged with respect to vthe remainder oftheshaft. iThis eccentric portion 64 journals the roller 62. 'It will be appreciated, therefore, that angularadjustments of the roller supporting shaft 5:63 A.will .eilect variations in the oscillatory moyementsof the table pari-,21 .andfits arm 55 for any given master cam p61. Anl adjustment indicating: scale 65 .isillustrated in Figs. Zand?l as `being associated with the upper .end .of the roller supporting shaftx3 and the .adjacent portion ofthe .oscillatingtable armi55.

Figs. 1, 4, i6 .and18 .disclose the master cam as :being supported by the .upper end. of avertical cam shaft B6. :This cam-shaft; issupported at its upper .end iportionin .arbearingl 61 thatis mounted in the left hand portion of the stationary ...table part 25. The lower end of. this camshaft .issupported in abearing 68 that vis suitablysup.-

portedwithinf the table loaseA, see `Fig. 8.

Adjacent the bearing 68, the cam shaft ..56 hasmounted thereon abevel gearalwhich constantly meshes with -a.;bevel pinion 1B. @This `beviel Vpinion is -drivenfby..a Apower unit 1l. .This power unit includes an electric-.motor withav reduction gear set interposed between the armature `shaft of the motor and the bevelpinion. 1B. l'-Ihis and preken .six .diereni .times :.150 brins aboli these incrementsy 0f the @am Shaft- 65.

The cam shaft. B `isprovided with a hand wheel 14 at its upper end by means of which the shaft may be manually adjusted to position any portion of the periphery of ther master cam .6I in engagement with the table oscillating roller 62. A- manual brake `releasing lever 15 is provided vso that the brake mechanism may be released whenever it is desiredto manually adjust the cam shaft 66.

With this explanation, it -will be `seen that stepby-step rotation of the master cam 6|, in the direction ofthe arrow line of Figs. 2 and '7, will cause the oscillating; tablev A2.1- to oscillate back-and forth about its axis that is represented by the dash line -oof Fig. ,8, The extent of .oscillatory movement in opposite directions will be governed by the six lobes of the master cam 6 l. A different master cam may be required for each different sized disc.

As the axis of oscillation of the table V21 vis always represented by the clash `line b, ,andas the axis of oscillation of the table part 21 must represent the axis with respect to which the several straight line cuts radiate, disc blanks of different sizes must be `positioned so that this axis of .oscillation b intersects the'inner end portion .of its groove locations. Fig. 8 illustrates the proper point for the axis of oscillation b to inter.- sect each space or groove l.at its inner end portion. The disc blank W shown in Fig. V8 is one of the largest sizes of discs that can be handled by this machine. It will be appreciated, therefore, that this disc has a hub portion whichl is of greater diameter than the hub portions of smaller sized discs. Therefore, when the smaller sized discs are being machined, they must occupy positions to the left of the disc blank position illustrated in Fig. 8.

The compensating chuck table 30 is adjustable horizontally in the guideway 29 of the oscillating gearsetv is enclosed witlflin` thefhousing portion v *12. 'The .opposite end portion .of the power unit` housing encloses anfelectrically controlled -'brake mechanism. This power unit functions to intermittently rotate thecam shaft 66. lThe `preferred type of master. camlfis .providedwith .six' lobes which.are1spaoed fill" apart. vIt is the `function of thevpower unit V1|y torrotatey the master cam 6| `six. diiferentgincrements,vor,'60 sixvfdiierent times, to .placezthe six. mastervcam lobes in. engagementy with the roller` 620i the table oscillating arm 55. Therefore, startingfwith lobenumberrl .of the. masterA camstin engagement with the-ro1lerx6.2, the electric motor. of

the power unit 1l Vwill be startedvand stopped six l Hdierent times to place lobes 21s to5 `inclusive .and thenlobe: l of the master camfl successively. in engagement. with the roller62. "The circuit tothe electric motorand. the `circuitto 'the electrically. controlled-.brake .mechanism `will. be made table 21 to effect this adjustment of the chuck 36, the work holding mandrel, and the disc blanks with respect to thevaxis .of oscillation b. To accomplish these adjustments of the compensating chuck table, a rod 1E Vis connected to the left hand end of the table. This rod passes longitudinally through the table arm .55 .and has an adjusting head 11 located Vat the outer end of the arm. vThe innerend of this rod is threadedly connectedat 18 tothe compensating chuck table.Y Acarriage loeatinggage block 19 is interposed between the end of the compensating chuck table A3i) and the surface 80 which is formed on the oscillating table arrnv55. different sized gage block 19 is required foreach ldifferent sized disc blank. .By passing the Yrod 16 througnthe proper .carriage locating ease block 19 and then tightening up the tl'neachedl connection 1B between the rod and thecompensating chuck table 3,0, the said tableA willbe fixed at the proper posi,- tion for locating the raxis 0f OSQHELQII bal? the inner end portion of. each tooth space or groove as the disc blank issuccessivelyindexed tothese groove locations..

When it is necessary .toposition a different master camftl on the upper end .of-thecam shaft 66, some means must be provided for forcing the oscillating table arm .55, and its roller. 62, yback away from the 4master .cam .periphery against the force of the compression spring 159'. .A screw jack 8l- .is illustratedin Figs.l 7 .andi :for-accom- .plishingthis desired result. This jack is thread- 

